Nrog rau txoj kev loj hlob sai ntawm peb lub teb chaws kev lag luam, tshwj xeeb tshaj yog kev loj hlob sai ntawm mining, smelting thiab casting industries nyob rau hauv xyoo tas los no, qhov kev thov rau hluav taws xob yog nce.Ntawm lawv, qhov nruab nrab zaus smelting furnace rectification cov cuab yeej yog ib qho ntawm cov khoom siv hluav taws xob loj tshaj plaws, tab sis vim tias feem ntau cov tuam txhab txo cov nqi khoom thiab tsis teeb tsa cov cuab yeej siv hluav taws xob sib raug zoo, cov phiaj xwm hluav taws xob tam sim no muaj kuab paug hnyav los ntawm kev sib haum xeeb zoo li huab cua huab cua.Pulse tam sim no txo cov kev ua haujlwm, kev sib kis thiab kev siv hluav taws xob hluav taws xob, cov khoom siv hluav taws xob overheats, ua rau kev co thiab suab nrov, muaj hnub nyoog rwb thaiv tsev, ua rau lub neej luv luv, thiab tseem ua rau tsis ua hauj lwm lossis kub hnyiab.Harmonics tuaj yeem ua rau muaj kev sib txuam hauv zos lossis cov resonance ntawm lub zog, yog li nthuav cov ntsiab lus sib haum xeeb thiab ua rau cov capacitors hlawv thiab lwm yam khoom siv.Harmonics kuj tuaj yeem ua rau kev ua haujlwm tsis raug ntawm kev tiv thaiv relays thiab cov khoom siv tsis siv neeg thiab tsis meej pem kev ntsuas lub zog.Harmonics sab nraum lub zog hluav taws xob tuaj yeem cuam tshuam nrog cov khoom siv sib txuas lus thiab cov khoom siv hluav taws xob.
Lub nruab nrab zaus hluav taws xob rauv yog ib qho ntawm qhov loj tshaj plaws kev sib haum xeeb nyob rau hauv daim phiaj load, vim hais tias nws yog hloov dua siab tshiab rau hauv nruab nrab zaus tom qab rectification.Harmonics yuav ua rau muaj kev phom sij loj rau kev ua haujlwm nyab xeeb ntawm daim phiaj hluav taws xob.Piv txwv li, kev sib haum xeeb tam sim no yuav ua rau muaj kev sib tw ntau zaus vortex hlau poob hauv lub transformer, uas yuav ua rau lub transformer overheat, txo qhov tso zis ntim ntawm lub transformer, ua rau lub suab nrov ntawm lub transformer, thiab ua rau muaj kev phom sij rau lub neej ntawm transformer. .Cov nyhuv sticking ntawm harmonic tam sim no txo qhov ntu ntu ntawm tus neeg xyuas pib thiab ua rau kom poob ntawm txoj kab.Harmonic voltage cuam tshuam rau kev ua haujlwm ib txwm muaj ntawm lwm yam khoom siv hluav taws xob ntawm daim phiaj, ua rau kev ua haujlwm tsis raug ntawm cov cuab yeej tswj tsis siv neeg thiab ntsuas ntsuas tsis raug.Harmonic voltage thiab tam sim no cuam tshuam rau kev ua haujlwm ntawm cov khoom siv sib txuas lus peripheral;transient overvoltage thiab transient overvoltage tshwm sim los ntawm harmonics puas lub rwb thaiv tsev txheej ntawm machinery thiab khoom, ua rau peb-theem luv-circuit faults thiab kev puas tsuaj rau transformers;harmonic voltage thiab tus nqi ntawm cov tam sim no yuav ua rau ib nrab series resonance thiab parallel resonance nyob rau hauv pej xeem lub hwj chim daim phiaj, uas ua rau muaj xwm txheej loj.Nyob rau hauv tus txheej txheem ntawm kev ua raws li qhov kev hloov pauv tas li, thawj yam uas tau txais los ntawm DC yog lub zog hluav taws xob square, uas yog sib npaug rau qhov kev txiav txim siab ntawm kev sib raug zoo.Txawm hais tias tom qab Circuit Court yuav tsum tau lim, qhov kev txiav txim siab harmonics tsis tuaj yeem lim tag nrho, uas yog vim li cas rau tiam ntawm harmonics.
Peb tsim cov lim dej ib leeg ntawm 5, 7, 11 thiab 13 zaug.Ua ntej lim cov nyiaj them, lub zog ntawm cov theem melting ntawm tus neeg siv qhov nruab nrab zaus hluav taws xob rauv yog 0.91.Tom qab cov khoom siv lim dej tau muab tso rau hauv kev ua haujlwm, qhov nyiaj them siab tshaj plaws yog 0.98 capacitive.Tom qab khiav cov khoom siv lim dej, tag nrho qhov cuam tshuam ntawm qhov hluav taws xob (THD tus nqi) yog 2.02%.Raws li lub zog zoo tus qauv GB / GB / T 14549-1993, qhov voltage harmonic (10KV) tus nqi tsawg dua 4.0%.Tom qab lim cov 5th, 7th, 11th thiab 13th harmonic tam sim no, cov lim dej yog li 82∽84%, ncav cuag tus nqi tso cai ntawm peb lub tuam txhab tus qauv.Zoo them nyiaj lim nyhuv.
Yog li ntawd, peb yuav tsum txheeb xyuas qhov ua rau muaj kev sib haum xeeb thiab siv cov kev ntsuas los tiv thaiv kev sib raug zoo ntawm kev sib raug zoo, uas yog qhov tseem ceeb los xyuas kom muaj kev nyab xeeb thiab kev lag luam ntawm cov tshuab hluav taws xob.
Ua ntej, qhov ua rau ntawm harmonics ntawm nruab nrab zaus rauv
1. Harmonics yog tsim los ntawm cov tsis-linear loads, xws li silicon tswj rectifiers, hloov cov khoom siv fais fab, thiab lwm yam. Lub harmonic zaus generated los ntawm cov load no yog ib tug ntau ntau ntawm cov kev khiav hauj lwm zaus.Piv txwv li, peb-theem rau-pulse rectifier feem ntau ua rau 5th thiab 7th harmonics, thaum peb-theem 12-pulse rectifier feem ntau ua rau 11th thiab 13th harmonics.
2. Vim yog cov harmonics generated los ntawm inverter loads xws li nruab nrab zaus furnaces thiab inverters, tsis tsuas yog ib tug harmonics generated, tab sis kuj fractional harmonics uas zaus yog ob zaug zaus ntawm lub inverter.Piv txwv li, qhov nruab nrab zaus qhov cub ua haujlwm ntawm 820 Hz siv peb-theem rau-pulse rectifier tsim tsis tau tsuas yog 5th thiab 7th harmonics, tab sis kuj fractional harmonics ntawm 1640 Hz.
Harmonics sib koom ua ke nrog kab sib chaws vim tias cov tshuab hluav taws xob thiab cov khoom siv hluav taws xob tsim cov khoom sib haum me me.
2. Kev puas tsuaj ntawm harmonics nyob rau hauv nruab nrab zaus rauv
Hauv kev siv lub tshuab hluav taws xob nruab nrab, ntau qhov kev sib haum xeeb yog tsim, uas ua rau muaj kev sib haum xeeb loj ntawm daim phiaj hluav taws xob.
1. Kev sib haum xeeb siab dua yuav ua kom muaj hluav taws xob tawg lossis tam sim no.Surge cuam tshuam yog hais txog lub sij hawm luv luv tshaj (tsawg) voltage ntawm lub kaw lus, uas yog, cov mem tes instantaneous voltage uas tsis tshaj 1 millisecond.Cov mem tes no tuaj yeem ua rau qhov zoo lossis tsis zoo, thiab tuaj yeem muaj cov xwm txheej lossis oscillatory xwm, ua rau cov khoom siv hlawv.
2. Harmonics txo qhov kev sib kis thiab kev siv hluav taws xob thiab cov khoom siv thermoelectric, ua kom muaj kev vibration thiab suab nrov, ua rau nws cov npoo hnub nyoog, txo cov kev pab cuam lub neej, thiab txawm tias malfunction lossis hlawv.
3. Nws cuam tshuam rau cov khoom siv hluav taws xob reactive ntawm cov khoom siv hluav taws xob;Thaum muaj kev sib haum xeeb hauv daim phiaj hluav taws xob, qhov hluav taws xob ntawm lub capacitor nce tom qab muab tso rau hauv capacitor, thiab tam sim no los ntawm lub capacitor nce ntxiv, uas ua rau lub zog poob ntawm lub capacitor.Yog hais tias tus mem tes tam sim no cov ntsiab lus siab, lub capacitor yuav dhau-tam sim no thiab loaded, uas yuav overheat lub capacitor thiab ceev cov embrittlement ntawm cov khoom ntug.
4. Qhov no yuav txo qhov ceev thiab kev pab cuam lub neej ntawm cov khoom siv hluav taws xob thiab ua kom poob;nws ncaj qha cuam tshuam rau kev siv peev xwm thiab kev siv tus nqi ntawm lub transformer.Nyob rau tib lub sijhawm, nws tseem yuav ua rau lub suab nrov ntawm lub tshuab hloov pauv thiab ua rau lub neej ua haujlwm luv ntawm lub transformer.
5. Nyob rau hauv cov cheeb tsam uas muaj ntau yam kev sib haum xeeb nyob rau hauv daim phiaj hluav taws xob, txawm tias muaj ntau qhov kev puas tsuaj ntawm cov khoom siv hluav taws xob sab hauv thiab sab nraud tau tshwm sim, thiab cov capacitors nyob rau hauv lub substation hlawv los yog tripped.
6. Harmonics kuj tuaj yeem ua rau kev tiv thaiv relay thiab tsis siv neeg ntaus ntawv tsis zoo, ua rau muaj kev tsis sib haum xeeb hauv kev ntsuas lub zog.Qhov no yog sab nrauv ntawm lub hwj chim system.Harmonics ua rau muaj kev cuam tshuam loj rau cov khoom siv sib txuas lus thiab cov khoom siv hluav taws xob.Yog li ntawd, kev txhim kho lub zog zoo ntawm qhov nruab nrab zaus qhov cub tau dhau los ua qhov tseem ceeb ntawm cov lus teb.
Peb, nruab nrab zaus rauv hluav taws xob harmonic tswj txoj kev.
1. Txhim kho lub peev xwm luv luv ntawm qhov kev sib txuas ntawm pej xeem ntawm daim phiaj hluav taws xob thiab txo qhov kev sib haum xeeb ntawm lub cev.
2. Harmonic tam sim no them nyiaj txais AC lim thiab nquag lim.
3. Ua kom cov mem tes ntau ntawm cov khoom siv hloov pauv kom txo qis kev sib haum xeeb tam sim no.
4. Zam kom tsis txhob muaj qhov resonance ntawm parallel capacitor thiab kev tsim ntawm qhov system inductance.
5. Lub high-frequency blocking ntaus ntawv txuas nrog nyob rau hauv series ntawm high-voltage DC kis tau tus mob kab los thaiv cov propagation ntawm high-order harmonics.
7. Xaiv cov khoom siv hluav taws xob hloov hluav taws xob zoo.
8. Cov khoom siv tau muab faib ua pawg rau cov khoom siv hluav taws xob, thiab cov cuab yeej lim tau raug teeb tsa.
Plaub, nruab nrab zaus cub hluav taws xob harmonic tswj cov cuab yeej
1. Hongyan passive lim ntaus ntawv.
Hongyan passive lim ntaus ntawv.Kev tiv thaiv yog lub capacitor series resistor, thiab cov lim passive yog tsim los ntawm lub capacitor thiab cov resistor nyob rau hauv series, thiab kev hloov kho yog txuas nrog rau qee yam.Ntawm qhov tshwj xeeb zaus, lub voj tsis muaj impedance yog tsim, xws li 250HZ.Qhov no yog qhov thib tsib harmonic lim.Txoj kev tuaj yeem them nyiaj rau ob qho tib si harmonics thiab reactive zog, thiab muaj cov qauv yooj yim.Txawm li cas los xij, lub ntsiab tsis zoo ntawm txoj kev no yog tias nws cov nyiaj them poob haujlwm yog cuam tshuam los ntawm impedance ntawm daim phiaj thiab lub xeev ua haujlwm, thiab nws yooj yim rau resonate nyob rau hauv parallel nrog lub kaw lus, ua rau muaj kev sib haum xeeb amplification, overload thiab kev puas tsuaj rau cov kua siv lead ua kua. lim.Rau cov loads uas txawv heev, nws yog ib qho yooj yim ua rau undercompensation los yog overcompensation.Tsis tas li ntawd, nws tsuas tuaj yeem them nyiaj ntau zaus sib haum xeeb, thiab cov txiaj ntsig them nyiaj tsis zoo.
2. Hongyan nquag lim khoom
Cov lim dej ua kom muaj kev sib haum xeeb ntawm qhov sib npaug ntawm qhov sib npaug thiab antiphase.Xyuas kom tseeb tias tam sim no ntawm lub hwj huam mov sab yog sine yoj.Lub tswv yim yooj yim yog los tsim cov nyiaj them tam sim no nrog tib lub zog raws li cov load harmonic tam sim no thiab thim rov qab txoj hauj lwm, thiab offset cov nyiaj tam sim no nrog cov load harmonic tam sim no kom tshem tawm cov mem tes tam sim no.Qhov no yog cov khoom sib haum xeeb tshem tawm txoj kev, thiab cov nyhuv lim dej zoo dua li cov lim dej tsis zoo.
3. Hongyan Harmonic Protector
Cov kev tiv thaiv kev sib haum xeeb yog sib npaug ntawm cov capacitor series reactance.Vim tias qhov impedance qis heev, qhov tam sim no yuav ntws ntawm no.Qhov no yog qhov sib cais impedance, yog li cov kev sib haum xeeb tam sim no txhaj rau hauv qhov system yog qhov pib daws teeb meem.
Harmonic protectors feem ntau yog ntsia rau pem hauv ntej ntawm cov khoom muag muag.Lawv yog cov khoom lag luam zoo sib haum xeeb, uas tuaj yeem tiv thaiv kev cuam tshuam, nqus 2 ~ 65 npaug ntau dua kev sib haum xeeb, thiab tiv thaiv cov khoom siv.Kev sib raug zoo ntawm kev tswj lub teeb pom kev zoo, khoos phis tawj, TV, lub cev muaj zog tswj cov cuab yeej, cov khoom siv hluav taws xob tsis cuam tshuam, CNC tshuab cov cuab yeej, rectifiers, precision instruments, thiab electronic control mechanisms.Tag nrho cov harmonics tsim los ntawm cov khoom siv hluav taws xob uas tsis yog-linear tuaj yeem ua rau tsis ua haujlwm hauv kev faib khoom nws tus kheej lossis hauv cov khoom siv txuas nrog lub kaw lus.Cov khoom tiv thaiv kev sib haum xeeb tuaj yeem tshem tawm cov kev sib haum xeeb ntawm lub zog tsim hluav taws xob, thiab tshem tawm cov kev txiav txim siab sib haum xeeb, lub suab nrov nrov, cov mem tes spikes, surges thiab lwm yam cuam tshuam rau cov khoom siv hluav taws xob.Cov khoom tiv thaiv kev sib haum xeeb tuaj yeem ua kom huv lub zog, tiv thaiv cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob them nyiaj, tiv thaiv tus neeg tiv thaiv kom tsis txhob poob siab, thiab tom qab ntawd tswj xyuas kev nyab xeeb ntawm cov khoom siv hluav taws xob hauv av siab.
Lub sij hawm xa tuaj: Plaub Hlis-13-2023